upper control arm wrench
Race Director
Joined: Nov 2006
Posts: 13,234
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From: Sunshine Coast, Queensland, Australia
2025 C3 of the Year Finalist - Modified
2024 C3 of the Year Finalist- Modified
2022 C3 of the Year Finalist - Modified
Cruise-In VIII Veteran
These are a splined bolt, much like a wheel stud. they are pressed into the frame and the splines prevent them from turning.
If yours are turning you have bigger problems than making up a custom wrench.
If yours are turning you have bigger problems than making up a custom wrench.
Thread Starter
Melting Slicks
Joined: Jan 2000
Posts: 3,326
Likes: 523
From: home
I know they are splined. Makes it impossible to align the car with them spinning. I ordered new ones hoping the splines on the original bolts are just worn. It's been 40 or so years since I've had these out.
Race Director
Joined: Nov 2006
Posts: 13,234
Likes: 7,827
From: Sunshine Coast, Queensland, Australia
2025 C3 of the Year Finalist - Modified
2024 C3 of the Year Finalist- Modified
2022 C3 of the Year Finalist - Modified
Cruise-In VIII Veteran
They should not spin. Perhaps someone pressed them out at one time. Then pressed them back in and the frame holes are now enlarged.
I would look into a bolt with a slightly larger spine.
They should not spin.
I would look into a bolt with a slightly larger spine.
They should not spin.
Thread Starter
Melting Slicks
Joined: Jan 2000
Posts: 3,326
Likes: 523
From: home
Thread Starter
Melting Slicks
Joined: Jan 2000
Posts: 3,326
Likes: 523
From: home
I had them out about 40 years ago when I replaced the upper control arm bushings. I guess I could do a mig tack weld to hold them or use a non locking nut and a lock nut as a secondary nut. Another possibility is to use a new wheel stud, depending on the knurl size of the oem bolt.
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Racer
Joined: Oct 2020
Posts: 416
Likes: 76
From: Atlantic Beach, FL
How did you end up resolving this problem? I just disassembled my entire front suspension and all four of my upper control arm studs were spinning free. I’m thinking I’ll have to find a new stud with larger splines.